12213131220 has 72 divisors (see below), whose sum is σ = 38996324640. Its totient is φ = 3085421760.

The previous prime is 12213131171. The next prime is 12213131263. The reversal of 12213131220 is 2213131221.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12213131193 and 12213131202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1782126 + ... + 1788965.

It is an arithmetic number, because the mean of its divisors is an integer number (541615620).

Almost surely, 2^12213131220 is an apocalyptic number.

12213131220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12213131220 is an abundant number, since it is smaller than the sum of its proper divisors (26783193420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12213131220 is a wasteful number, since it uses less digits than its factorization.

12213131220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3571125 (or 3571120 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 12213131220 its reverse (2213131221), we get a palindrome (14426262441).

Subtracting from 12213131220 its reverse (2213131221), we obtain a palindrome (9999999999).

It can be divided in two parts, 122131 and 31220, that added together give a palindrome (153351).

The spelling of 12213131220 in words is "twelve billion, two hundred thirteen million, one hundred thirty-one thousand, two hundred twenty".